quad: Update hw_iface.h docstring

quad/src/quad_app/hw_iface.h

@@ -10,8 +10,8 @@
  * NOTE:
  * If you wound up here after following some IDE function declaration trail,
  * you've hit the end of the application layer. Go to the location of the
- * hardware layer appropriate for your circumstance:p
- * ../../xsdk_worksapce/modular_quad_pid -> running quad_app on the Zybo
+ * hardware layer appropriate for your circumstance:
+ * ../../xsdk_worksapce/real_quad -> running quad_app on the Zybo
  * ../virt_quad -> running quad_app in a Unix environment
  */